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The article presents the issue of cleanliness of oils and fuels used in combustion engines of automotive and rail vehicles. In the article, after reviewing current solutions of lubrication or fuel systems, attention was drawn to the possibility of using additional oil and fuel filtering systems to increase the cleanliness class. For this purpose, the methodology of testing the condition of oil and fuels in a portable laboratory in accordance with the requirements of SAE AS 4059, ISO 4406:99 and NAS 1638 standards was presented. Additionally, the results of tests of sample new engine, gear and hydraulic oils were presented, which according to the cited standards are out-of-class oils and require additional microfiltration.